pt repo is out of date

You might want to mention in the README that the pt repo is not compatible with post-1.0 devise. I had an error after twitter return "Could not authorize you from Twitter because "Invalid response" and it turned out to be because it's using 'user_info' instead of 'info' against the omniauth hash.

(cf https://github.com/intridea/omniauth/wiki/Upgrading-to-1.0 for the benefit of others.)
